Tom's Hardware Guide has a screenshot gallery and a writeup about their first impressions of the breathtaking Crysis:
As amazing as it looked, what really convinced me was the way the world reacted to the player. Individual leaves moved when hit by bullets, bushes shook as I brushed past, and everything reacted just as you'd expect in real life. The developer doing my tour told me that everything in the game has AI scripting, not just the enemies. That means when you shoot a tree, the tree has to figure out what to do in response to it.